No it's the opposite. The males have a lot of spots on their faces, cheeks and gill plates. The females don't. However, although this is highly predictive, it is not absolutely foolproof.
The males also tend to be larger and slighthly thinner in body shape than the females.
The very best way of sexing them is by looking at the shape of the vent. Females is larger and rounder. Males is smaller and V-shaped. Do a bit of googling to get some comparison pictures.